Introduction:

Electrical energy involves different interactions than the chemical energy we just studied. Instead of changes in molecules, we see changes in the electrons that surround atoms.

Activity:

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  Try this simulation, from PhET Interactive Simulations, University of Colorado, http://phet.colorado.edu/en/simulation/travoltage and click Run Now!

1. Try leaving his hand pointed upwards and moving his foot on the carpet. What happens? Why?
2. What happens when you try building up charge while his finger is on the door?
3. Build up charge in his body while his finger is away from the door, and then slowly move it closer. How far away is his hand when he starts getting shocked?
4. Repeat the previous step, building up different amounts of charge in his body. Does he start getting shocked at a different distance depending on how much charge he has built up? Why?
5. Watch the path of the charges as they move through his body. Do they always take the same general path? Why?
6. Why must you rub his foot on carpet?
7. Why does the door handle discharge his body?
   • Extension. Make a list of other materials could he touch that would give the same reaction?

Conclusion:

What did you learn about electricity from this exercise?

Enrichment:

• Watch the video below of Lightning Striking the Empire State Building.

• How was the "Travoltage" simulation similar to the Lightning Striking the Empire State Building?